The Leading Journal for the Tyre Recycling Sector

The Leading Journal for the Tyre Recycling Sector

Guidelines Drafted to Regularise Pakistan Pyrolysis Plants

The Punjab Environment Protection Agency (EPA) has drafted guidelines to regularise pyrolysis plants operating across the Punjab province without any legal cover.

According to The News International, Sources in EPA revealed that during the recent smog season, strict action was taken against these plants and many were demolished and sealed either by the District Administration or by the EPA.

Currently, the majority of pyrolysis plants operating in the province used to dispose of used tyres and extract carbon, wire and low quality furnace oil, which were sold in the open market.

Usually steel mills, steel re-rolling mills and furnaces purchased the low quality furnace oil and carbon from the pyrolysis plants to run their units and caused air pollution. Former DG EPA Khawaja M Sikandar Zeeshan during his tenure drafted the guidelines. EPA department, sources said, they will soon finalise the guidelines and then they will be sent to the Punjab government for final approval.

The guidelines said the demand of vehicles and other transportation had increased due to urbanisation and ultimately needed proper disposal of used tyres. The proposed guidelines were applicable to the pyrolysis plants which should comply with the Punjab Environment Quality Standards (PEQS) or have been assessed by the EPA in terms of lab analysis reports for the compliance of PEQS.

As per the draft, the pyrolysis plants will file an initial Environmental Examination report and will be granted environmental approval after the review process by the competent authority.

The EPA, in the draft guidelines, proposed that in view of provision of green belt requirements and open areas to be left for the movement of fire-brigade vehicles, the minimum area required for the plants shall be as 1 acre for 15 to 30 ton/batch and 1.5 acres for 30 to 60 ton/batch.

Under the Pollution Abatement Measures, the plants will be allowed to all type of authorised fuels for initial heating of the reactor, the emissions emitted from the fuel burning shall be passed through an Alkai scrubber before discharging into the atmosphere through a stack of minimum 15-metre height for proper dispersion of gasses. The furnace for heating the reactor should be optimally designed and operated so that proper burning of the fuel takes place and generation of carbon Monoxide (CO) emissions are minimised. The uncondensed gases should be flared in a designated brick furnace equipped with stack linked with the main scrubbing system. The carbon powder produced should be removed from the reactor in completely closed and controlled conditions in such a manner that the contents of the reactor are not open to the atmosphere at any point. The end of carbon powder line is to be attached to a bagging plant where all the carbon powder will be packed in High Density Polyethylene (HDPE) Bags (or other non-porous material) and the bags shall be mechanically sealed.

The guidelines also state that only one exhaust after the bagging plant shall be allowed and the same should be attached to stack of minimum 15-metre height after passing through an Air Pollution Control Device such as an Alkali Scrubber to prevent dust/odour emission.

The unit shall carry out stack and ambient air quality monitoring for SO2, recoverable suspended particulate matter, Carbon Monoxide, and Hydrocarbons at least bi-annual from an EPA registered laboratory and the unit will maintain a log book for recording the plant operations, monitoring of the stack emissions, and ambient air quality, generation and utilisation of wastewater and sales of various products and by-products.

The guidelines proposed that the wastewater generated from the oil-water separator should not be discharged anywhere and should be mixed with the carbon powder, which may be sold to the cement manufacturing plants or other such industries. The generation, transportation, and disposal of carbon powder to the cement manufacturing plants or any other such industry shall be recorded through a manifest system.

To keep the surrounding atmosphere aesthetic, a greenbelt of minimum 2-metre width all along the boundary of the plant shall be developed with a minimum three rows of broad-leaved trees while the open space to be left after the green belt for the movement of the fire tenders shall be all around the plant or as per the requirement of Explosive Department. No bi-product material is allowed to be stored in this open space, the guidelines propose.

The guidelines further propose that the raw material, product (pyrolysis oil), and carbon powder (by-product) shall be stored in areas separate/distinct from the processing area where the reactors are installed.

Under the mandatory housekeeping and safety requirements, the guidelines propose that at least three digital pressure and temperature gauges outside the reactor shall be provided, which should be easily readable to a person on the floor for accurate measurement of the reactor pressure and temperature.

The oil recovered from the pyrolysis process (at a temperature above approximately 250 Celsius) shall be stored in a suitable tank in a safe condition. Carbon powder should be placed in closed conditions and may also be conveyed, collected, and-handled by using any closed suitable source.

For reuse of excess uncondensed gasses, the guidelines proposed that the pyrolysis plant can use excess uncondensed gases from the reactor in another reactor(s) (if available) or can be used as a substitute heating for another activity. The guideline strictly prohibits the  use of wood/coal in the plants, however in case of startup, wood/coal may be used. The fuel gases generated from burning of fuel shall be released through the stack of minimum height 20-metre from the ground level.

In a batch process, a sufficient break of about 8 hours is required to be kept from the safety point of view in order to avoid any sort of explosion due to the continuous heating process, the guidelines suggested and added therefore, the equipment after one batch process, should be kept unused to cool it down to the normal temperature of the environment.

For ensuring safety of workers, the plant should be operated under continuous supervision of a qualified person with a minimum of two years’ experience in operating similar processes while all persons/workers in the plant premises shall wear an air filter mask to avoid inhaling of the fine carbon powder particles and the plant shall also implement all safety measures as provided in by the relevant authorities and fire safety norms.

Source: The International News (Pakistan)